Materials Literature
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For a binary polymer brush layer, we investigated the morphological state, the structure reordering, and the nanomechanical properties as a function of treatment with selective solvents. Two incompatible polymers, poly(methyl acrylate) (PMA) and poly(styrene- co -2,3,4,5,6-pentafluorostyrene) (PSF), were randomly graf…
A postsynthesis method of separating metallic from semiconducting single-walled carbon nanotubes and a method based on absorption spectroscopy for assay of the separation efficiency are described. The separation method relies on chemical discrimination in the charge-transfer complex formation between bromine and the m…
Orbital ordering occurs in many transition metal compounds with Jahn–Teller ions (Cu 2+ , Mn 3+ , low-spin Ni 3+ , Ti 3+ etc). It plays an important role in these materials. At the same time, exchange interactions in orbitally degenerate systems are inherently frustrated, even in materials with simple crystal lattices…
A pressure-filter-template approach was employed to prepare polyelectrolyte nanotubes through layer-by-layer deposition in the alumina template. With the thicker wall, the ordered polymer nanotubes possess a high flexibility. The results demonstrate that the electrostatic interactions of polyelectrolytes play a key ro…
The controlled self-assembly of complex molecules into well defined hierarchical structures is a promising route for fabricating nanostructures. These nanoscale structures can be realized by naturally occurring proteins such as tobacco mosaic virus, capsid proteins, tubulin, actin, etc. Here, we report a simple altern…
A simple method of electrochemical deposition was adopted to prepare conductive hydrophobic zinc oxide (ZnO) thin films. The surface structures were characterized by sanning electron microscopy (SEM) and atomic force microscopy (AFM). Wettability studies revealed that the surface of the as-prepared thin films showed a…
This paper presents the results of a preliminary assessment conducted to estimate the thermal response and erosion lifetime of the ITER divertor targets clad either with carbon-fibre composite or tungsten during type I ELMs. The one-dimensional thermal/erosion model, used for the analyses, is briefly described. It inc…
Well-aligned ZnO nanorods with identical crystallographic orientation have been synthesized using a vapor transport deposition process. Orientation-ordered nanorods grow normal to the c planes of the as-deposited micrometer-sized ZnO rods on a polycrystalline Al 2 O 3 substrate, and each nanorod is along [0001] and en…
Molecular surface enhanced Raman scattering (SERS) in compact clusters of 30−70 nm Ag nanocrystals has shown single molecule Raman scattering cross sections that are orders of magnitude larger than free space single molecule luminescence cross sections. We analyze certain aspects of this phenomenon with new numerical…
For Abstract see ChemInform Abstract in Full Text.
We examine the wetting behavior of various n -alkanes on both oxide-coated and silane-coated Si wafers. n -Hexane and n -heptane completely wet a silane-coated Si wafer while n -octane exhibits a wetting transition at T w ≃ 60 °C. In the complete wetting region, the wetting layer thicknesses as a function of temperatu…
The crystal structure of Rhodoferax fermentans high-potential iron protein (HiPIP) has been solved by MAD methods using the anomalous signal from the Fe atoms in the [Fe(4)S(4)] cluster present in the protein and refined to a resolution of 1.45 A. The peptide chain is well defined except in the N- and C-terminal areas…
We investigate theoretically the interfacial properties of supercooled water, both with respect to the vapor−liquid and, for the first time, for the hypothesized low-temperature liquid−liquid transition. We use the van der Waals theory of interfaces, together with two closely related microscopic models of waterlike as…
For some applications for fluoropolymers they must be subjected to high-energy radiation, e.g., when they are grafted with styrene using an irradiation method to produce fuel cell membranes or matrix supports for combinatorial chemistry. In some of these applications they may be subjected to mechanical stress or eleva…
The enthalpy recovery mechanism of polymers is usually described in terms of the Tool−Narayanaswamy−Moynihan model (TNM). Even if it is able to qualitatively reproduce all the peculiar features of the aging process, clear discrepancies have been found in quantitative analysis. In this work, differential scanning calor…
We present excitation-energy dependent Raman measurements between 2.05 and 2.41 eV on the same individual carbon nanotube. We find a change in the Raman frequencies of both the $D$ mode ($63\text{ }\text{ }{\mathrm{c}\mathrm{m}}^{\ensuremath{-}1}/\mathrm{e}\mathrm{V}$) and the high-energy modes. The observed frequenci…
Large-scale synthesis of arrays of high-aspect-ratio rigid vertically aligned carbon nanofibres, Melechko, A V, McKnight, T E, Hensley, D K, Guillorn, M A, Borisevich, A Y, Merkulov, V I, Lowndes, D H, Simpson, M L
Abstract Nanoporous polyimide films were prepared in two steps. The first step is the preparation of poly(urethane‐imide) films by casting blend solutions containing various weight percentages of poly(amic acid) and phenol blocked polyurethane prepolymer (from 1,6‐hexamethylene diisocyanate and poly(ethylene glycol)).…
Laser photolysis at 193 nm of gaseous carbon disulfide into CS and S in the absence and excess of N 2 is controlled by two-photon-induced depletion of CS 2 and affords chemical vapor deposition of (CS) n polymer and S n . The proposed polymerization mechanism of CS is explained by an intermediacy of C 2 S 2 species. T…
Abstract Triblock copolymers and pentablock terpolymers of n ‐hexyl isocyanate (H), styrene (S), and isoprene (I) of the type HSH (six samples, M n :49–163 K, weight % of H:5–59), HIH (two samples, M n :75 and 83.4 K, weight % of H:16 and 40), HSISH (one sample, M n :79.4 K, weight % of H:13), and HISIH (one sample, M…